General instructions for electrical contractors and engineers
Answers to the most common questions about installation work and principles.
Inspections of electrical installations and registry notifications
Instructions related to commissioning and periodic inspections of electrical installations and equipment.
Low-voltage connections
Instructions related to the protection of low-voltage connections and the sizing of the connection cables
- How to acquire an electrical connection, and a list of required documents
- Delivery boundary of the connection (point of connection)
- Main protective device of the connection
- Network dimensioning, short-circuit current
- Dimensioning of the connection cable
- Protection of the connection cable
- Electricity metering location
Medium-voltage connections
Instructions related to the planning, commissioning, outages, and back measurements of medium-voltage connections
- Planning a medium-voltage connection
- New medium-voltage connections
- Increasing the size of a connection
- Commissioning a medium-voltage connection
- Operation and protection of the connection
- Ordering an outage
- Sub-metering
Meters and metering cabinets
Instructions for planning meterings, metering cabinets, and load control
- General information about electricity metering
- Load control and tariffs
- Indirect metering and instrument transformers
- Metering cabinets
- Terminal blocks and measurement wires
- Pulse output from the meter
- Sealing of switchboards and measuring devices
Electricity generation
Instructions for planning and implementing electricity generation
- General information about electricity generation
- Connectivity
- Small-scale generation (max. 1 MW)
- Professional electricity generation
- Technical requirements
- Disconnection of production equipment
- Operation during network disturbances and faults, and anti-islanding protection
- Electricity generation metering
- Netting (only for production plants under 100 kW)
Reactive power compensation and frequency converter interference protection
Instructions for implementing reactive power compensation and interference protection and maintenance for frequency converters.
Locks
Instructions for implementing locks on the switchboard.
Backup power
When connecting backup power, you must ensure that the installation of backup power devices complies with regulations. Incorrectly connected backup power equipment can pose a life-threatening risk to the building’s residents and to personnel repairing the electricity network, as well as damage devices connected to the network.
Read more about the use of backup power in the link below.